Cannabis is the most widely used illicit drug in the United States, and worldwide, with 1 in 10 users estimated to meet diagnostic criteria for cannabis dependence. Avoidance of withdrawal symptoms (e.g., disturbances in mood, sleep, and craving) is a common relapse precipitant. Cannabis use also impairs executive cognitive functions thereby increasing vulnerability to relapse and reducing the ability to benefit from behavioral therapy. There are no pharmacological treatments for cannabis dependence, despite the large number of afflicted individuals and the limitations of behavioral therapies which do not remediate withdrawal and are associated with high rates of treatment failure. The primary aim of this clinical trial is to evaluate the efficacy and safety of a novel neurokinin1 (NK1) receptor antagonist, aprepitant (Emend), (125mg/day), in outpatients with current cannabis dependence. The main hypothesis to be tested is to evaluate the relative efficacy of aprepitant 125 mg/d vs. placebo for reducing cannabis withdrawal symptoms in cannabis dependent outpatients, specifically anxiety, mood, craving and sleep.

This study will be a Phase II, single-site, 8-week, randomized, double-blind, placebo-controlled, parallel group comparison of aprepitant (125 mg/d) or placebo. Subjects will be 100 outpatients seeking treatment for current cannabis dependence with no clinically significant medical or psychiatric disorders (including substance use disorders or a positive drug screen for substances other than cannabis or nicotine). All subjects will receive weekly manual-guided abstinence-oriented counseling to facilitate showing a drug effect above and beyond available therapies (Weeks 0-8). Research assessments of marijuana use and withdrawal and drug safety and tolerability will occur weekly through the treatment phase of the 8-week study. Post treatment follow-up assessments will occur at Weeks 9 and 12. Neuropsychological testing will occur at Weeks 0 and 4 and 8.

Smoked MJ daily at least 25 days per month during the 90 days prior to randomization

Current cannabis use verified by a positive urine test > 50 ng/ml

At least a 2-year history of regular MJ use

Willing and able to give informed consent

Exclusion Criteria:

Abstinent from cannabis more than 2 days at the time of randomization

Currently meets DSM IV criteria for dependence on substances, or has urine drug screen positive for substances, other than cannabis or nicotine

Meets DSM IV criteria for a major AXIS I disorder other than cannabis and nicotine dependence,

Active suicidal ideation

Significant medical disorders that will increase potential risk or interfere with study participation,

Females who are pregnant, nursing or who are sexually active with child-bearing potential and refuse to use a double-barrier method of birth control during the study and for up to 4 weeks after study termination

Ongoing treatment with medications that may affect study outcomes,

Use of CYP3A4 strong inhibitors (e.g., ketoconazole, itraconazole, nefazodone, troleandomycin, clarithromycin, ritonavir, nelfinavir) and CYP3A4 moderate inhibitors (e.g., diltiazem) within the 2 week period prior the study drug administration or within 5 half-lives of the respective medication, whichever is longer, until study conclusion.

Consumption of grapefruit or grapefruit products from at least 2 weeks prior to study drug administration until study conclusion.

Ongoing treatment with medications that are primarily metabolized by CYP3A4 and may have increased plasma concentrations when co-administered with aprepitant, such as pimozide, terfenadine, astemizole or cisapride or corticosteroids, as well as benzodiazepines including midazolam, alprazolam, and triazolam.

Ongoing treatment with medications that are primarily metabolized by CYP2C9 (e.g., warfarin, tolbutamide).

Use of drugs (e.g., rifampin, carbamazepine, phenytoin) or herbal supplements (e.g., St John's wort) that induce CYP3A4 activity and may result in reduced plasma concentrations of aprepitant and decreased efficacy of aprepitant.

Inability to understand and/or comply with the provisions of the protocol and consent form.

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01611948